Efficiency Ratings: Presbyterian

Using an NBA Efficiency Rating Formula, TDD tracks the best statistical performances of the season.

A quick way NBA coaches measure a player's game performance is by evaluating his efficiency. In order to find a player's efficiency the following formula is used:

((Points + Rebounds + Assists + Steals + Blocks) - ((Field Goals Att. - Field Goals Made) + (Free Throws Att. - Free Throws Made) + Turnovers)).

For example, compare the following stat lines:

Player A: 17 points (5-of-22 FG, 7-9 FT), 8 rebounds, 6 assists, 3 steals, 4 turnovers.

Player B: 15 points (5-8 FG, 3-4 FT), 4 rebounds, 7 assists, 2 turnovers

Who had the better game? Using the above referenced formula player B, who hit five of eight shots and committed two turnovers registered a +20 efficiency total while Player A who missed 17 shots and had four turnovers had just a +11 rating.


Preseason All-American Jahlil Okafor scored 19 points in his debut, and the fourth-ranked Blue Devils had 30 assists in a 113-44 rout of Presbyterian on Friday night in the opening round of the Coaches vs. Cancer Classic.

All four members of a heavily hyped freshman class reached double figures for Duke (1-0): Grayson Allen had 18, and Justise Winslow and Tyus Jones had 15 apiece.

Duke shot 61 percent and hit 16 3-pointers, and its assist total was three shy of the school record -- and its most since 1998 -- in the third most-lopsided victory in school history.


(change from previous game)

Notes: This was the highest rating achieved by a team in the five years we’ve tracked these efficiency ratings. Duke’s 10 rotational players recorded a +157 total and a .818 per minute rating.

The equation is geared more, in theory, to interior players who should shoot a higher percentage, and on average won’t turn the ball over as much as the wings and point guards. That held true on Friday as Jahlil Okafor debuted with a +28 score thanks to a 90 percent shooting clip from the field. Okafor logged just 23 minutes, and still posted what would have been last season’s 11th best overall performance.

Unlike a season ago, Duke has a lot of balance. The Blue Devils had five players score 20 or above with Tyus Jones, Rasheed Sulaimon, Grayson Allen and Quinn Cook all playing well. Sulaimon was particularly impressive in that he took just four shots from the field, hitting all of them. He also made all of his free throws and posted a 4-to-1 assist to turnover ratio.


Throughout the season TDD will track the various highs and lows using the formula.

Ten Most Efficient Performances

  • Jahlil Okafor v. Presbyterian (+28)
  • Grayson Allen v. Presbyterian (+22)
  • Tyus Jones v. Presbyterian (+21)

Five Least Efficient Performances*

  • Semi Ojeleye (+5)
*- players must play at least five minutes or factor into the box score to be considered for per game E-ratings


Cumulative Season ratings for the Blue Devils. (E/game)*
  • Jahlil Okafor +28 (28.0)
  • Justise Winslow +12 (12.0)
  • Tyus Jones +21 (21.0)
  • Quinn Cook +20 (20.0)
  • Rasheed Sulaimon +20 (20.0)
  • Amile Jefferson +11 (11.0)
  • Grayson Allen +22 (22.0)
  • Matt Jones +7 (7.0)
  • Semi Ojeleye +5 (5.0)
  • Marshall Plumlee +15 (15.0)

Games Factored In: N/A


Cumulative Season ratings per minute for the Blue Devils. (E/minutes)
  • Grayson Allen: 1.222
  • Jahlil Okafor: 1.217
  • Rasheed Sulaimon: 1.111
  • Tyus Jones: 0.913
  • Marshall Plumlee: 0.882
  • Quinn Cook: 0.800
  • Amile Jefferson: 0.688
  • Justise Winslow: 0.600
  • Matt Jones: 0.538
  • Semi Ojeleye: 0.263


Tracking the most and least efficient performances by player
  • Jahlil Okafor +28 / —
  • Justise Winslow +12 / —
  • Tyus Jones +21 / —
  • Quinn Cook +20 / —
  • Rasheed Sulaimon +20 / —
  • Amile Jefferson +11 / —
  • Grayson Allen +22 / —
  • Matt Jones +7 / —
  • Semi Ojeleye +5 / —
  • Marshall Plumlee +15 / —


- Grayson Allen was the team’s most efficient player, while Okafor was the highest scoring player.

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